/*
 * Copyright 2022 Apollo Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 */
package com.ctrip.framework.apollo.configservice.util;

import com.ctrip.framework.apollo.configservice.service.AccessKeyServiceWithCache;
import com.ctrip.framework.apollo.core.signature.Signature;
import com.google.common.base.Strings;

import java.util.List;
import javax.servlet.http.HttpServletRequest;

import org.apache.commons.lang.StringUtils;
import org.springframework.stereotype.Component;

/**
 * @author nisiyong
 */
@Component
public class AccessKeyUtil {

    private static final String URL_SEPARATOR = "/";
    private static final String URL_CONFIGS_PREFIX = "/configs/";
    private static final String URL_CONFIGFILES_JSON_PREFIX = "/configfiles/json/";
    private static final String URL_CONFIGFILES_PREFIX = "/configfiles/";
    private static final String URL_NOTIFICATIONS_PREFIX = "/notifications/v2";

    private final AccessKeyServiceWithCache accessKeyServiceWithCache;

    public AccessKeyUtil(AccessKeyServiceWithCache accessKeyServiceWithCache) {
        this.accessKeyServiceWithCache = accessKeyServiceWithCache;
    }

    public List<String> findAvailableSecret(String appId) {
        return accessKeyServiceWithCache.getAvailableSecrets(appId);
    }

    public String extractAppIdFromRequest(HttpServletRequest request) {
        String appId = null;
        String servletPath = request.getServletPath();

        if (StringUtils.startsWith(servletPath, URL_CONFIGS_PREFIX)) {
            appId = StringUtils.substringBetween(servletPath, URL_CONFIGS_PREFIX, URL_SEPARATOR);
        } else if (StringUtils.startsWith(servletPath, URL_CONFIGFILES_JSON_PREFIX)) {
            appId = StringUtils.substringBetween(servletPath, URL_CONFIGFILES_JSON_PREFIX, URL_SEPARATOR);
        } else if (StringUtils.startsWith(servletPath, URL_CONFIGFILES_PREFIX)) {
            appId = StringUtils.substringBetween(servletPath, URL_CONFIGFILES_PREFIX, URL_SEPARATOR);
        } else if (StringUtils.startsWith(servletPath, URL_NOTIFICATIONS_PREFIX)) {
            appId = request.getParameter("appId");
        }

        return appId;
    }

    public String buildSignature(String path, String query, String timestampString, String secret) {
        String pathWithQuery = path;
        if (!Strings.isNullOrEmpty(query)) {
            pathWithQuery += "?" + query;
        }

        return Signature.signature(timestampString, pathWithQuery, secret);
    }
}
